准噶尔盆地车排子凸起油气资源潜力与成藏模式

Hydrocarbon potential and accumulation model in Chepaizi uplift, Junggar Basin

中国石化准噶尔盆地西缘区块主要位于车排子凸起,由于远离油源,自身地质条件复杂,导致油气发现缓慢,勘探程度较低。为了明确该区油气资源潜力,有效指导下步勘探方向,基于车排子凸起地层与沉积相分布,系统分析油源、储盖组合等成藏条件,开展了西缘区块油气资源潜力再认识,研究认为该区虽然远离烃源岩,但石油地质条件较好,有利于油气聚集,是油气长期运移指向区,资源潜力大。在油源对比、成藏期次研究基础上,明确了断层—毯砂输导性能,建立了盆缘远离油源地区"侧源供烃、断层垂向输导、毯砂横向输导、毯缘聚集"的油气成藏及富集模式。以此认识成功指导了钻探部署,取得了一系列新的商业发现,效果明显。

Sinopec＇s licensed block in the western margin of the Junggar Basin is predominantly distributed in the Chepaizi uplift. Since it is far from oil sources and has complicated geologic conditions, the block is less explored with protracted exploration cycle. To clarify the hydrocarbon potential in the block and thereby provide effective guidance for future exploration operations, in-depth researches were conducted based on the distribution of formations and sedimentary facies within the Chepaizi uplift to analyze oil sources, reservoir-cap rock assemblages and other reservoir conditions systematically. Research results show that the study area has favorable petroleum geologic conditions for hydrocarbon accumulation. As the final destination for long-term migration of hydrocarbons, the block has great hydrocarbon potential. Through correlation of oil sources and investigation on accumulation periods, the fault-blanket sandstone conductivity was determined, and the hydrocarbon accumulation model characterized by ＂hydrocarbons supplied by lateral sources, with faults providing vertical conductivity and blanket sandstones providing horizontal conductivity, and accumulated at blanket margins＂ was established. In accordance with these conclusions, drilling operations were successfully deployed, and a series of discoveries with commercial values were obtained.